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Observation on the Efficacy of Root Canal Fiber Posts in the Restoration of Residual Roots and Crowns in Dentistry

Objective: To investigate and analyze the clinical efficacy of root canal fiber posts in the restoration of residual roots and crowns in dentistry. Methods: A total of 60 patients with residual roots and crowns (103 affected teeth in total) admitted to our hospital between January 2011 and December 2013 were selected. All 60 patients underwent root canal treatment and were randomly divided into two groups of 30 each: a study group and a control group. Patients in the study group were treated with glass fiber posts, while those in the control group were treated with cast metal posts. The success rates after treatment were compared between the two groups, and a retrospective comparative analysis was conducted. Results: The two groups were followed up for 1 to 2 years. In the study group, treatment was successful in 28 of the 30 patients, with a success rate of 93.33%; in the control group, treatment was successful in 24 of the 30 patients, with a success rate of 80%. The difference was

2015-08-24
Technical Analysis and Management of High-Pile Wharf Construction

Since the reform and opening up, China's import and export trade has shown unprecedented prosperity, and port and wharf construction has also developed rapidly. Among these, high-pile wharves have been gradually applied in ports. Starting from an analysis of the structural characteristics of high-pile wharves, this paper elaborates in detail on the technical problems existing in high-pile wharf construction and proposes effective solutions.

2015-08-24
Construction Experience in Quality Control of Prestressed Static-Pressed Pipe Piles

Based on the characteristics of the typical soft soils in the water-town region of northern Zhejiang, this paper analyzes the common quality problems in the construction of static-pressed prestressed concrete pipe piles, and proposes relatively effective methods for controlling pile foundation quality along with relevant construction measures, thereby improving the acceptance pass rate of pile foundations.

2015-08-24
Construction Technology of Vibro-Driven Cased Gravel Piles

In the 1950s, vibro-driven cased gravel piles were first applied in Japan as a ground treatment method, and were introduced into China in the late 1950s. This paper mainly introduces the reinforcement mechanism and construction technology of vibro-driven cased gravel piles, and demonstrates the densification and liquefaction-resistance effects of gravel piles through engineering examples.

2015-08-24
Effect of Two Root Canal Sealers on the Bond Strength of Two Types of Fiber Posts

Objective To investigate the effect of two root canal sealers on the bond strength of two types of fiber posts. Methods Ninety-six extracted maxillary central incisors were divided into four groups according to the type of sealer and the type of fiber post, with 24 teeth in each group: Group I was filled with Guttaflow sealer and RebildaPost fiber posts; Group II with Guttaflow sealer and MacrolockTMPost fiber posts; Group III with Cortisomol paste and RebildaPost fiber posts; and Group IV with Cortisomol paste and MacrolockTMPost fiber posts. The micro push-out test was used to measure the shear bond strength of each group, and the fracture patterns at the bonding interface were observed. Results The mean shear bond strength of Group II

2015-08-24
Application of Cast-in-Place Pipe Pile Technology in Soft Foundation Reinforcement Construction of Urban Roads

In major urban construction projects, urban road construction is of great importance. Although considerable progress has been made in urban road construction in China, numerous difficulties and problems still arise during highway construction, with soft soil foundations being the most prominent and a common challenge in highway construction. Based on the problems identified in previous cases and construction experience, this paper provides a detailed analysis of the application of soft soil foundation reinforcement technology.

2015-08-24
Quality Control of Prestressed Concrete Pipe Piles

Prestressed concrete pipe piles (hereinafter referred to as pipe piles) generally have two construction methods: static pressing and hammer driving. For pile foundations, the pile position, pile length, pile diameter, pile body quality, and single pile bearing capacity should be checked.

2015-08-24
Case Study of Vibratory Driven-Casing Gravel Pile Treatment of Backfill Foundation

Drawing on the application of vibratory driven-casing gravel piles in soft soil foundation treatment for the renovation project of the Guangzhou Asian Games Equestrian Venue, this paper introduces the reinforcement mechanism and construction method of vibratory driven-casing gravel piles. The reinforcement effect is evaluated through field tests. The paper concludes that the vibratory driven-casing gravel pile is a highly practical soft soil foundation treatment technique, featuring simple equipment, low cost, low noise, a short construction period, and a significant effect in improving foundation bearing capacity.

2015-08-24
Rectification of Prestressed Pipe Piles in Soft Soil Foundations and Reinforcement and Strengthening Treatment of Broken Piles

During the construction of prestressed statically pressed pipe piles in soft soil foundations, quality problems such as deviation, inclination, and even fracture of engineering piles are frequently encountered. If pile replacement is adopted on a large scale, both the construction period and costs will increase substantially, and finding suitable locations for replacement piles will also be difficult. Combining engineering practice, based on pile foundation testing results, and through analysis of the causes of pipe pile deviation and fracture, we formulated a rectification scheme for prestressed pipe piles and conducted theoretical analysis and practical verification of the reinforcement and strengthening of broken piles. Rectification and reinforcement strengthening were carried out on general Class III piles, and re-testing showed that they met the design requirements. Engineering practice has proven that the rectification and strengthening measures for prestressed pipe piles are not only reliable, but also solve the practical difficulties of pile replacement, achieving good practical results for reference by peers.

2015-08-24
Technical Application of Sleeve-Valve-Pipe Dual-Liquid Grouting for Strengthening Deep Sand Layers to Prevent Hole Collapse in Impact-Bored Piles at the Wutongshu Building in Hengqin, Zhuhai

At the Wutongshu Building in the Hengqin New Area of Zhuhai, the gravelly sand layer is deeply buried, thick, water-rich, and highly permeable. After excavation for the tower's cast-in-place piles, additional piles had to be installed; during the impact-boring of these replacement piles, the large hydraulic head difference created by the excavation led to continuous water inflow, running sand, and hole collapse. The causes of the drilling failures were analyzed in detail, and following verification, the sleeve-valve-pipe dual-liquid stratified grouting method was selected to strengthen and seal off the deep gravelly sand layer at and around the pile locations. The construction scheme for sleeve-valve-pipe dual-liquid grouting is described in detail. The strengthened gravelly sand layer met the requirements for impact boring, the running sand and hole collapse were brought under control, and the replacement pile construction was completed smoothly.

2015-08-24
An IoT Data Collection and Transmission Strategy for the Pipe Pile Industry

The Internet of Things (IoT) generally involves a large number of nodes with limited energy. To enable nodes to operate normally over extended periods, effective data collection and transmission strategies are essential. Combining existing IoT application data technologies, this paper designs an IoT data collection and transmission strategy for pipe pile manufacturing enterprises, thereby achieving a lightweight data process, alleviating network bandwidth pressure, reducing system energy consumption, and enhancing the real-time performance and robustness of the system.

2015-08-24
Key Control Points for SM Method Pile Support in Deep Foundation Pits Exceeding Negative Ten Meters

With the continuous development of the social economy, underground deep foundation pits are being designed with increasing frequency, and they are continually developing toward greater depths and larger base areas. The SM method pile support construction technique is currently a relatively mature and reliable construction method; however, during construction it involves factors such as high cost, a relatively long construction period, and construction inconvenience, which greatly affect the achievement of the project's overall objectives. This paper attempts to summarize the key points and difficulties in the management of the method pile construction process, so as to reduce their impact on project objectives to a relatively low level.

2015-08-24

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